ncd: Optimize value::append().
ncd: Optimize value::append().

LazyZhu/badvpn,binondord/badvpn,binondord/badvpn,binondord/badvpn,linfengfeiye/badvpn,linfengfeiye/badvpn,LazyZhu/badvpn,tempbottle/badvpn,LazyZhu/badvpn,Git-Host/badvpn,Git-Host/badvpn,linfengfeiye/badvpn,linfengfeiye/badvpn,PowerOlive/badvpn,linfengfeiye/badvpn,binondord/badvpn,Git-Host/badvpn,tempbottle/badvpn,PowerOlive/badvpn,binondord/badvpn,PowerOlive/badvpn,LazyZhu/badvpn,LazyZhu/badvpn,Git-Host/badvpn,PowerOlive/badvpn,tempbottle/badvpn,tempbottle/badvpn,tempbottle/badvpn,Git-Host/badvpn,PowerOlive/badvpn